Rotary pivoted hammer



March 22, 1932. H. J. SHELTOYN ROTARY PIVOTED HAMMERv Filed May 6, 1929 INVENTQR 522i ATTORNEY.

Patented Mar. 22, 1932 UETE STATES HARRY J. SHELTON, or UNIVERSITY CITY, MISSOURI ROTARY rrvo'rnn HAMMER 7' Application filed May 6,

not in operative position from wear by the material being reduced.

In the accompanying drawings in which like reference numerals indicate correspondin g parts,

Fig. 1 represents a grist mill with my ham:

mers applied thereto;

Fig. 2, an enlarged face view of my hammer; and

Fig. 3, an edge view of the same. Referring to the drawings, a horizontal rotary shaft 1 carries a series of spaced discs 2, between whiohare mounted my hammers 3 pivoted on removable hammer rods 4 passing through the discs near their periphery. These constitute the rotor cylinder which is enclosed in a suitable casing 5, having an inlet hopper 6 and a cage 7. p

These hammers are made of flat thin straight bars of hardened steel or other suitable material, and havea hole near each end for reversible pivotal mounting on said hammer rods 4. The ends of said hammers near the holes are preferably widened laterally across the face forming double heads, and connected by a reduced middle portion 9.

Along the side edges of the outer ends are formed cutting teeth 10, preferably saw tooth in shape, with their cutting edges at right angles to the faces as in the upper part of Fig. 3, or inclined diagonally to the axis of rotation as 10a in the lower part of 3 and in the lower right hand of Fig. 2. These side edges thus present rows of sharp cutting teeth that are approximately radially disposed. There are thus four side edges near 1 PATENT 1 orricei 1929. Serial No. 360,657.

the, ends provided "with sharp cutting teeth in preferably parallel rows, and each toothed edgemay be brought into operative position as the front outer edge of the hammer by removing the hammer rod and successively reversing the hammer thereon.

The head that is operatively pivoted at any time on its hammer rod is hidden within the periphery of the discs as shown in Fig. 1, where a disc is broken away to show the inner pivoted end of a hammer. The'teeth on thisinner end (for the time being) are thus protected from abrasive action of the grist material, as only the neck and outer head (for the timebeing) extend beyond the periphery. The middle portion connecting these double, toothed heads in its preferably reduced shape shown may be straight as in Fig.

1, or curved inwardly between the teeth of, the two heads as in Fig. 2. This reduced middle portion facilitates passage through the material surrounding the discs, and the inwardly curved neck shape promotes the effectiveness of the forwardly projecting teeth 4 on the front edge (for the time being) A reduction in the amount of metal is also e'f-' fected and consequent cheaper production is obtained.

Each hammer may have both the inclined teeth and the straight across teeth, as shown in Fig. 2.

As the grist material is often in fibers or slivers that are disposed every way, the inclined teeth on one or more side edges of the heads are adapted to meet such material transversely, especially when the inclined edges alternate with the straight across cutting edges in adjacent hammers as operative edges, as such alternate arrangement may be 9O readily obtainedby disposing the hammers on the hammer rods accordingly (Fig. 1).

. Applicant is aware of hammers having a hole near each end for reversing; also of hammers having their outer ends stepped down from the center; also that curved hammers with sharp teeth on their front curved face have been used; and also that hammers with rounded ends have been provided with teeth tapering backward from the front edge in grooves or channels transversely and vanishing towards the rear, have been employed; and, finally, that straight bar hammers having rounded notches in their side edges leaving portions forming blunt teeth, have been used, and lays no claim to such forms.

I claim:

1. A pulverizing hammer comprising a plate having a centrally disposed indentation in each of its two longitudinal edges and a plurality of sharp teeth formed at each of the four corners of the plate in the material jthereof which projects out laterally beyond said' indentations, said plate having a perforation located inwardly from and adjacent each end thereof.

2. A pulverizing hammer comprising a plate having a centrally disposed indentation in each of its ends and having a centrally disposed indentation ineach of its two longitudinal edges and a plurality of sharp teeth formed at each of the four corners of the plate in the material thereofwhich projects out laterally beyond said indentations, said plate having a perforation located inwardly from and adjacent each end thereof.

In testimony whereof I have aflixed my signature, 7

' HARRY J. SHELTON. 

